S6E22: The One with the Ring

Chandler and Phoebe shop for a ring for Monica. Chandler finds the perfect one, but Phoebe accidentally lets it get away. While Chandler is busy with getting the ring back, Joey and Ross are lead to believe that he's mad at them, so they decide to team up and give him a cold shoulder treatment. Rachel continues to date Paul and wants him to open up to her, however, he opens up a bit too much.